Did you get expected altimeter readings with wview? I don't know about
TWI, but I know the original Davis VP adjusted barometer that uses
temperature correction renders meaningless (to me at least) values at over
7000ft, but then the >41" you're seeing is also meaningless to me.
On my VP console I have an offset added of close to 7" to get a reasonable
reading on the console, then I have my weewx config file set up as:
[StdCalibrate]
[[Corrections]]
# For each type, an arbitrary calibration expression can be given.
# It should be in the units defined in the StdConvert section.
# Example:
foo = foo + 0.2
barometer = 1.298 * barometer - 8.918558
altimeter = barometer
pressure = barometer * 0.766377
The idea being that the station pressure, and also each change in pressure,
is approx. .298 less than SLP. If my math is correct your pressure would
need to be adjusted closer to .35. Assuming you don't use an offset you
could just set "barometer = 1.35 * barometer", or if you do use an offset
of 8" it would be something like "barometer = 1.35 * barometer - 10.90" or
"barometer = 1.35 * (barometer - 8)".
Maybe someone else can give a better solution or correct my calculations,
but at least I seem to get more reasonable readings.
On Saturday, January 7, 2023 at 2:25:28 PM UTC-7 pannetron wrote:
> Newbie here, coming from wview, and using a Texas Weather Instruments
> station. I've adjusted my console to display -- and report via its serial
> port -- an "altimeter" version of my barometric pressure so I can most
> easily compare my readings with other stations. Using the default weewx
> configuration, it must assume the reported pressure is gauge pressure since
> the calculated altimeter reading is up over 41"! At my home's altitude of
> 8258', my gauge pressure is around 22.15". It seems that I have two
> options for configuring weewx to see my correct barometric pressure. One
> is to set the
> [StdWXCalculate] like this:
>
> [[Calculations]]
>
> pressure = software
> altimeter = hardware
> barometer = software
>
> My other option to let weewx assume the pressure my station reports is
> gauge pressure and apply a correction offset of approximately -8". Which
> option is the preferred method?
>
> One final question. Since my barometric pressure sensor is indoors in the
> console, should the temperature used for corrections be indoor or outdoor
> temperature?
>
> Thanks, Russ.
>
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